Ferrous seal sliding parts and producing method thereof

Abstract

A ferrous seal sliding part excellent in heat crack resistance, seizing resistance and abrasion resistance is provided. The ferrous seal sliding part having a seal sliding surface, wherein the seal sliding surface has a martensite parent phase which forms a solid solution with carbon of 0.15 to 0.6 wt % and contains a first dispersion material of at least either cementite of 5 to 70% by volume or MC-type carbide of 0.1 to 10% by volume and a second dispersion material of at least either graphite of 1 to 15% by volume or Cu alloy phase of 1 to 20% by volume dispersed therein, with a total content of the first dispersion material and the second dispersion material being 5 to 70% by volume.

1 - 15 . (canceled)  
   
   
       16 . A producing method of a ferrous seal sliding part having a step for casting a cast iron containing carbon of 2 to 5 wt %, Si of 0.5 to 6 wt %, Cr of 0.3 to 5 wt % and one or more alloy element selected from the group consisting of Al, Mn, Ni, Cu, Co, Mo, W, V, Ti, Zr, Nb, Ta, P, B, Ca and S, 
 wherein said seal sliding part has a martensite parent phase which forms a solid solution with carbon of 0.15 to 0.6 wt % and contains a first dispersion material of at least either cementite of 5 to 70% by volume or MC-type carbide of 0.1 to 10% by volume and a second dispersion material of at least either graphite of 1 to 15% by volume or Cu alloy phase of 1 to 20% by volume dispersed therein, with a total content of said first dispersion material and said second dispersion material being 5 to 70% by volume.    
   
   
       17 . A producing method of a ferrous seal sliding part according to  claim 16 , 
 wherein said casting step is for casting said cast iron by a centrifugal method, using a mold which is heated to Ms temperature or more of a parent phase of said cast iron, and quenching said cast iron after releasing from said mold.    
   
   
       18 . A producing method of a ferrous seal sliding part according to  claim 16 , 
 wherein, after said casting step, a step for re-heating said cast iron at Al transformation temperature or more of said cast iron and then graphitizing is carried out before said quenching step.